Magnesium Fluoride (MgF2) is a colourless, hard and durable material and is birefringent. The material’s durability and resistance to mechanical and thermal shock enable it to be used in harsh conditions, in the form of windows, while its birefringence makes it useful for polarizers in the UV waveband. It transmits between 0.1µm and 7µm and at over 90% between 0.4-5.0µm. Magnesium Fluoride has a hardness of about HK576, making it the hardest of the optical fluorides. It is stable in water, which means that it can be used for outer surfaces, such as windows.
Magnesium Fluoride makes excellent Rochon Polarizers with a waveband of, for example, 0.13 to 7µm. The separation angle, which is the angle between the ordinary and extraordinary rays, is about 10° at 1.55µm. The extinction ratio is about 10,000:1 with an output aperture of about 10mm (Crystal size dictates). Figure x shows the Rochon polarizers form and mode of operation.
Magnesium Fluoride is typically used to transmit in the VUV range at 121nm. It can be used to transmit in the infrared, but offers largely inferior transmission to Barium Fluoride and Calcium Fluoride.
Knight Optical supply a range of quality Magnesium Fluoride optical components including Magnesium Fluoride windows, Magnesium Fluoride lenses, Magnesium Fluoride prisms, and Magnesium Fluoride blanks either from stock or custom made to your specification for a range of applications. Every component is individually tested by our highly skilled technicians in our state of the art metrology lab to ensure all components meet our high quality standards.
Contact our multilingual technical sales team and discover how Knight Optical’s high quality Magnesium Fluoride optical components and service can improve your instrumentation and supply chain experience.
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